US3113596A - Manufacture of thermionic valve grids - Google Patents

Manufacture of thermionic valve grids Download PDF

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Publication number
US3113596A
US3113596A US786530A US78653059A US3113596A US 3113596 A US3113596 A US 3113596A US 786530 A US786530 A US 786530A US 78653059 A US78653059 A US 78653059A US 3113596 A US3113596 A US 3113596A
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United States
Prior art keywords
grid
fins
wires
central region
forming
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Expired - Lifetime
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US786530A
Inventor
Lane Clayton Arbuthnot
Edmonton Reginald John
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ASS ELECT IND WOOLWICH Ltd
ASSOCIATED ELECTRICAL INDUSTRIES (WOOLRICH) Ltd
Original Assignee
ASS ELECT IND WOOLWICH Ltd
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Application filed by ASS ELECT IND WOOLWICH Ltd filed Critical ASS ELECT IND WOOLWICH Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F45/00—Wire-working in the manufacture of other particular articles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture

Definitions

  • apparatus for forming a grid for a thermionic valve comprises a mandrel having fins extending radially outwards on rerespectively show inaccuracies progrid in accordance of the grid is accurately dimensioned, for instance by being circular as shown in the figure.
  • the grid wire 1 is placed fairly loosely around the and 3 between which is positioned a circular mandrel 4 as shown in FIG. 2.
  • two outer tools 5 and 6 are then applied to either side or" the mandrel to force the wires to take up the shape shown in FIG. 1.
  • the grid may not always be accurately circular around the manin accordance with the present invention therefore a finned mandrel 7, as shown in FIG.
  • the fins and M of the mandrel extend between the two sup- Outline of the mandrel, the fins and the support wires.
  • it and 9 ensure that the mandrel is maintained centrally of the support wires. Adequate clearance is provided between the circular par-t of the mandrel and the forming tools to prevent flattening 0f the grid wire over the working section.
  • the finned mandrel also has the advantage of holding the support wires at predetermined fixed positions so as it is formed, thus working section.
  • the invention not only applies to working sections but working section as in FIG. 5.
  • a method of forming a grid for a thermionic valve comprising the steps of forming a wire into a helix, loosegrids having circular may be applied to any shape of for instance shown at 1%, 11 and 12 port wires, and then applying pressure to the wound grid only, by means of two forming said central region, to

Description

Bea- 10, 1963 Q L E ETAL I 3,113,596
MANUFACTURE OF THERMIONIC VALVE GRIDS Filed Jan; 15, 1959' emu 70 0779/1 071/944 BY ""m' United States Patent ()fifice Patented Dec. 10, 1963 MANUFACTURE 6F THERMIQNIC VALVE GRHDS Clayton Arhuthnot Lane, Enfield, and Reginald John,
Edmonton, London, Engiand, assignors to Assoeiated Electrical Industries (Weolrich) Limited, Londen, England, a British company Filed Jan. 13, 1959, Ser. No. 786,539 Ciaiins priority, appiication Great Britain .lan. 16, 1958 2 Ciaims. (Cl. Mai-J15) This invention relates to the manufacture of grids for thermionic valves.
It has been the usual practice to produce a shaped grid for a thermionic which is both accurately circular and in which the working part of the grid is accurately central with reference to the support wires.
It is an object of the present invention to provide a method of and apparatus for forming a grid accurately.
grid wire around two spaced apart support wires and a mandrel having fins extending between the two wires and then pressing a forming tool around the wound grid to make the grid wire follow the outline at least of the fins.
In another aspect of the present invention apparatus for forming a grid for a thermionic valve comprises a mandrel having fins extending radially outwards on rerespectively show inaccuracies progrid in accordance of the grid is accurately dimensioned, for instance by being circular as shown in the figure. To produce this shape the grid wire 1 is placed fairly loosely around the and 3 between which is positioned a circular mandrel 4 as shown in FIG. 2. To form the grid two outer tools 5 and 6 are then applied to either side or" the mandrel to force the wires to take up the shape shown in FIG. 1. With such a method the grid may not always be accurately circular around the manin accordance with the present invention therefore a finned mandrel 7, as shown in FIG. 4 is used. The fins and M of the mandrel extend between the two sup- Outline of the mandrel, the fins and the support wires. In addition tools it and 9 ensure that the mandrel is maintained centrally of the support wires. Adequate clearance is provided between the circular par-t of the mandrel and the forming tools to prevent flattening 0f the grid wire over the working section.
The finned mandrel also has the advantage of holding the support wires at predetermined fixed positions so as it is formed, thus working section.
The invention not only applies to working sections but working section as in FIG. 5.
What we claim is:
1. A method of forming a grid for a thermionic valve comprising the steps of forming a wire into a helix, loosegrids having circular may be applied to any shape of for instance shown at 1%, 11 and 12 port wires, and then applying pressure to the wound grid only, by means of two forming said central region, to
thereby be stretched over said central region.
2. The method of claim 1 wherein said grid wires are stretched beyond their elastic limit.
References Cited in the file of this patent UNITED STATES PATENTS 2,064,169 Kershaw Dec. 15, 1936 2,379,135 Ekstedt et al June 26, 1945 2,429,062 Johansen Oct. 4, 1947 2,794,934 Eisan June 4, 1957 2,812,499 Robertson Nov. 5, 1957 2,880,496 Benedict et a1. Apr. 7, 1959 2,989,019 Van Sciver June 20, 1961 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent Nor. 3 113596 December 10 1963 Clayton Arbuthnot Lane et al It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.
In. the grant lines 2 and 3 and 13 and in the heading to the printed specification lines 4 and 5 name of assignee for "Associated Electrical Industries (Woolrich) Limited", each occurrence read Associated Electrical Industries (Woolwich) Limited --a Signed and sealed this 5th day of May 19640 (SEAL) Attcst:
ERNEST WU SWIDER EDWARD J: BRENNER Attesting Officer Commissioner of Patents

Claims (1)

1. A METHOD OF FORMING A GRID FOR A THERMIONIC VALVE COMPRISING THE STEPS OF FORMING A WIRE INTO A HELIX, LOOSELY PLACING THE HELICALLY WOUND GRID WIRE AROUND TWO SPACED APART SUPPORT WIRES, INSERTING INSIDE THE GRID BETWEEN SAID TWO WIRES A MANDREL HAVING A SHAPED CENTRAL REGION AND A PAIR OF FINS EXTENDING RADIALLY OUTWARDS ON OPPOSITE SIDES OF SAID CENTRAL REGION, SAID FINS BEING IN EDGE CONTACT WITH AND IN A PLANE BETWEEN THE SAID SUPPORT WIRES, AND THEN APPLYING PRESSURE TO THE WOUND GRID IN THE VICINITY OF THE FINS ONLY, BY MEANS OF TWO FORMING TOOLS HAVING CLEARANCE AROUND SAID CENTRAL REGION, TO CAUSE THE GRID WIRES TO FOLLOW THE OUTLINE OF THE FINS AND THEREBY BE STRETCHED OVER SAID CENTRAL REGION.
US786530A 1958-01-16 1959-01-13 Manufacture of thermionic valve grids Expired - Lifetime US3113596A (en)

Applications Claiming Priority (1)

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GB3113596X 1958-01-16

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2064169A (en) * 1936-01-03 1936-12-15 Sovereing Machinery Company Method of and apparatus for producing radio tube grids
US2379135A (en) * 1943-11-29 1945-06-26 John W Ekstedt Method of producing grids for electron discharge devices
US2429062A (en) * 1944-06-08 1947-10-14 Clearing Machine Corp Triple-action press
US2794934A (en) * 1952-11-20 1957-06-04 Raytheon Mfg Co Grids and methods and apparatus for forming same
US2812499A (en) * 1952-07-11 1957-11-05 Bell Telephone Labor Inc Helix assembly for traveling wave tube
US2880496A (en) * 1955-09-29 1959-04-07 Westinghouse Electric Corp Bend-stretch methods of forming heavy fan blades
US2989019A (en) * 1957-05-20 1961-06-20 Budd Co Method of deep drawing sheet material

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2064169A (en) * 1936-01-03 1936-12-15 Sovereing Machinery Company Method of and apparatus for producing radio tube grids
US2379135A (en) * 1943-11-29 1945-06-26 John W Ekstedt Method of producing grids for electron discharge devices
US2429062A (en) * 1944-06-08 1947-10-14 Clearing Machine Corp Triple-action press
US2812499A (en) * 1952-07-11 1957-11-05 Bell Telephone Labor Inc Helix assembly for traveling wave tube
US2794934A (en) * 1952-11-20 1957-06-04 Raytheon Mfg Co Grids and methods and apparatus for forming same
US2880496A (en) * 1955-09-29 1959-04-07 Westinghouse Electric Corp Bend-stretch methods of forming heavy fan blades
US2989019A (en) * 1957-05-20 1961-06-20 Budd Co Method of deep drawing sheet material

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